body{
			margin: 0px;
			background-image: url(../img/背景1.jpg);
		}
		.th1{
			border: 1px solid #FFFFFF; width: 30%;height: 40px;text-align: center;font-size: 16px;background-color:#BCE8F1;
		}
		.th2{
			border: 1px solid #FFFFFF;text-align: center;background-color:#FFFFFF;
		}
		.th3{
			border: 1px solid #FFFFFF;width: 30%;height: 80px;text-align: center;font-size: 16px;background-color:#BCE8F1;
		}
		.th4{
			border: 1px solid #FFFFFF;width: 30%;height: 300px;text-align: center;font-size: 16px;background-color:#BCE8F1;
		}
		a{
			text-decoration: none;
		}
		#tab{
			width: 550px; font-family: '微软雅黑'; margin-left: auto;margin-right: auto; margin-top: 100px;background-color: #DFF0D8;
		}
		#floort{
			width: 550px;
			text-align: right;
			margin: auto;
			
			
			border-top: 0px;
		}